From: Mac Chiang <mac.chiang@xxxxxxxxx>
amplifier feedback is not modeled as being dependent on any active
output. Even when there is no playback happening, parts of the graph,
specifically the IV sense->speaker protection->output remains active
and this prevents the DSP from entering low-power states.
This patch suggest a machine driver level approach where the speaker
pins are enabled/disabled dynamically depending on stream start/stop
events. DPAM graph representations show the feedback loop is indeed
disabled and low-power states can be reached.
Signed-off-by: Jenny TC <jenny.tc@xxxxxxxxx>
Signed-off-by: Harshapriya.n <harshapriya.n@xxxxxxxxx>
Signed-off-by: Mac Chiang <mac.chiang@xxxxxxxxx>
---
sound/soc/intel/boards/kbl_da7219_max98927.c | 73 +++++++++++++++++++++++++++-
1 file changed, 71 insertions(+), 2 deletions(-)
diff --git a/sound/soc/intel/boards/kbl_da7219_max98927.c b/sound/soc/intel/boards/kbl_da7219_max98927.c
index f72a7bf..1efe7fd 100644
--- a/sound/soc/intel/boards/kbl_da7219_max98927.c
+++ b/sound/soc/intel/boards/kbl_da7219_max98927.c
@@ -219,8 +219,60 @@ static int kabylake_ssp0_hw_params(struct snd_pcm_substream *substream,
return 0;
}
+static int kabylake_ssp0_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ int j, ret;
+
+ for (j = 0; j < rtd->num_codecs; j++) {
+ struct snd_soc_dai *codec_dai = rtd->codec_dais[j];
+ const char *name = codec_dai->component->name;
+ struct snd_soc_component *component = codec_dai->component;
+ struct snd_soc_dapm_context *dapm =
+ snd_soc_component_get_dapm(component);
+ char pin_name[20];
+
+ if (strcmp(name, MAX98927_DEV0_NAME) &&
+ strcmp(name, MAX98927_DEV1_NAME) &&
+ strcmp(name, MAX98373_DEV0_NAME) &&
+ strcmp(name, MAX98373_DEV1_NAME))
+ continue;
+
+ snprintf(pin_name, ARRAY_SIZE(pin_name), "%s Spk",
+ codec_dai->component->name_prefix);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ ret = snd_soc_dapm_enable_pin(dapm, pin_name);
+ if (ret) {
+ dev_err(rtd->dev, "failed to enable %s: %d\n",
+ pin_name, ret);
+ return ret;
+ }
+ snd_soc_dapm_sync(dapm);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ ret = snd_soc_dapm_disable_pin(dapm, pin_name);
+ if (ret) {
+ dev_err(rtd->dev, "failed to disable %s: %d\n",
+ pin_name, ret);
+ return ret;
+ }
+ snd_soc_dapm_sync(dapm);
+ break;
+ }
+ }
+
+ return 0;
+}
+
static struct snd_soc_ops kabylake_ssp0_ops = {
.hw_params = kabylake_ssp0_hw_params,
+ .trigger = kabylake_ssp0_trigger,
};
static int kabylake_ssp_fixup(struct snd_soc_pcm_runtime *rtd,
@@ -950,6 +1002,7 @@ static int kabylake_card_late_probe(struct snd_soc_card *card)
{
struct kbl_codec_private *ctx = snd_soc_card_get_drvdata(card);
struct kbl_hdmi_pcm *pcm;
+ struct snd_soc_dapm_context *dapm = &card->dapm;
struct snd_soc_component *component = NULL;
int err, i = 0;
char jack_name[NAME_SIZE];
@@ -976,9 +1029,25 @@ static int kabylake_card_late_probe(struct snd_soc_card *card)
if (!component)
return -EINVAL;
- return hdac_hdmi_jack_port_init(component, &card->dapm);
- return 0;
+ err = hdac_hdmi_jack_port_init(component, &card->dapm);
+
+ if (err < 0)
+ return err;
+
+ err = snd_soc_dapm_disable_pin(dapm, "Left Spk");
+ if (err) {
+ dev_err(card->dev, "failed to disable Left Spk: %d\n", err);
+ return err;
+ }
+
+ err = snd_soc_dapm_disable_pin(dapm, "Right Spk");
+ if (err) {
+ dev_err(card->dev, "failed to disable Right Spk: %d\n", err);
+ return err;
+ }
+
+ return snd_soc_dapm_sync(dapm);
}
/* kabylake audio machine driver for SPT + DA7219 */
--
2.7.4
_______________________________________________
Alsa-devel mailing list
Alsa-devel@xxxxxxxxxxxxxxxx
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
